package net.dodoman.inherit;

class ParentClass {
	private String privateField = "父类变量--private";

	/* friendly */String friendlyField = "父类变量--friendly";

	protected String protectedField = "父类变量--protected";

	public String publicField = "父类变量--public";

	// private的变量无法直接访问，因此我们给他增加了一个访问方法
	public String getPrivateFieldValue() {
		return privateField;
	}
}

public class SubClass extends ParentClass {
	private String privateField = "子类变量--private";

	/* friendly */String friendlyField = "子类变量--friendly";

	protected String protectedField = "子类变量--protected";

	public String publicField = "子类变量--public";

	// private的变量无法直接访问，因此我们给他增加了一个访问方法
	public String getPrivateFieldValue() {
		return privateField;
	}

	public static void main(String[] args) {
		// 为了便于查阅，我们统一按照private、friendly、protected、public的顺序
		// 输出下列三种情况中变量的值

		// ParentClass类型，ParentClass对象
		ParentClass parentClass = new ParentClass();
		System.out.println("ParentClass parentClass = new ParentClass();");
		System.out.println(parentClass.getPrivateFieldValue());
		System.out.println(parentClass.friendlyField);
		System.out.println(parentClass.protectedField);
		System.out.println(parentClass.publicField);

		System.out.println();

		// ParentClass类型，SubClass对象
		ParentClass subClass = new SubClass();
		System.out.println("ParentClass subClass = new SubClass();");
		System.out.println(subClass.getPrivateFieldValue());
		System.out.println(subClass.friendlyField);
		System.out.println(subClass.protectedField);
		System.out.println(subClass.publicField);

		System.out.println();

		// SubClass类型，SubClass对象
		SubClass subClazz = new SubClass();
		System.out.println("SubClass subClazz = new SubClass();");
		System.out.println(subClazz.getPrivateFieldValue());
		System.out.println(subClazz.friendlyField);
		System.out.println(subClazz.protectedField);
		System.out.println(subClazz.publicField);
	}
}
